Veteran of eight Arthurian novels (The Lance Thrower , etc.), Whyte turns to the Crusades with this tedious first volume of a Knights Templar trilogy. In 1088, young knight Hugh de Payens is initiated into the secret Order of the Rebirth of Sion, who believe the Christian Church to be "an invalid creation... built upon a myth." Founded by Jewish families fleeing the Romans, the Order believes that the truth about Jesus and the founding of Christianity lie buried beneath the Temple Mount in Jerusalem. When Pope Urban calls for a Holy Crusade to liberate Jerusalem from the Muslims, the Order—given to interminable monologues—sees an opportunity to perhaps retrieve those ancient documents and sends Sir Hugh and others to join the Crusaders, yakking the whole way. After the bloody fall of Jerusalem, Sir Hugh establishes a new order of warrior monks as a cover for the excavation of the Temple Mount, and the race is on to find the hidden treasure, if it exists, before their activities are discovered. This tepid Templar foray will be crowded out at the gates. (Aug.)